- K618i is looks all the same as the V630i, but it can have unbranded software, there's no "Vodafone" logo on the phone, and Sonyericsson gives a 256 MB M2 card with the phone. - V630i has 10 MB internal memory, K618i has 16 MB. - Call records: V630i has 20 received, 20 dialed and 20 missed calls, K618i has 30 received, 30 dialed and 30 missed calls.

- W660i has better looking Walkman mobile interface. - W660i has 16 MB internal memory (V630i has 10 MB) - Note that the radio function will not work after upgrading to W660i, because V630i doesn't have the radio-hardware.